diff --git a/bin/debugger.cpp b/bin/debugger.cpp
index 3fd50fc..8642898 100644
--- a/bin/debugger.cpp
+++ b/bin/debugger.cpp
@@ -73,7 +73,7 @@ namespace {
 	AddressMap wbrkMap; // write breaks.
 	ToolMap tbrkMap; // tool breaks.
 
-	std::unordered_map<std::string, uint32_t> envMap;
+	std::unordered_map<std::string, uint32_t> SymbolTable;
 
 
 	void hexdump(const uint8_t *data, ssize_t size, uint32_t address = 0)
@@ -827,14 +827,17 @@ void SetXRegister(unsigned reg, uint32_t value)
 }
 
 
-uint32_t EnvLookup(const std::string &s)
+uint32_t VariableGet(const std::string &s)
 {
-	auto iter = envMap.find(s);
-	if (iter == envMap.end()) return 0;
+	auto iter = SymbolTable.find(s);
+	if (iter == SymbolTable.end()) return 0;
 	return iter->second;
 }
 
-
+void VariableSet(const std::string &key, uint32_t value)
+{
+	SymbolTable.emplace(key, value);
+}
 
 // TODO -- RUN command - reload, re-initialize, re-execute
 // TODO -- parser calls commands directly (except trace/step/run/etc)
@@ -845,14 +848,14 @@ void Shell()
 	add_history("!Andy, it still has history!");
 
 
-	Loader::Native::LoadDebugNames(envMap);
+	Loader::Native::LoadDebugNames(SymbolTable);
 
-	//for (const auto &kv : envMap)
+	//for (const auto &kv : SymbolTable)
 	//{
 	//	printf("%06x: %s\n", kv.second, kv.first.c_str());
 	//}
 
-	envMap = LoadTrapFile(MPW::RootDirPathForFile("Traps.text"));
+	//SymbolTable = LoadTrapFile(MPW::RootDirPathForFile("Traps.text"));
 
 	// start it up
 	printf("MPW Debugger shell\n\n");
diff --git a/bin/debugger.h b/bin/debugger.h
index 06e9528..2c82142 100644
--- a/bin/debugger.h
+++ b/bin/debugger.h
@@ -25,13 +25,70 @@ struct Command {
 	uint32_t argv[10];
 };
 
+struct Token {
+	// constructor is not allowable because
+	// this is a union in the parser.
+#if 0
+	Token():
+	intValue(0), stringValue(0), subtype(0)
+	{}
+
+	Token(uint32_t i) : 
+	intValue(i), subtype(0)
+	{}
+
+	Token(std::string *s, unsigned st  = 0) : 
+	intValue(0), stringValue(s), subtype(st)
+	{}
+#endif
+
+	static Token Make()
+	{
+		Token t = {0, 0, 0};
+		return t;
+	}
+
+	static Token Make(uint32_t i)
+	{
+		Token t = { i, 0, 0};
+		return t;
+	}
+
+	static Token Make(std::string *s, uint32_t st)
+	{
+		Token t = { 0, s, st};
+		return t;
+	}
+
+	uint32_t intValue;
+	std::string *stringValue;
+	unsigned subtype;
+
+
+#if 0
+	Token& operator=(uint32_t rhs)
+	{
+		intValue = rhs;
+		stringValue = 0;
+		subtype = 0;
+		return *this;
+	}
+#endif
+	
+	operator uint32_t() const
+	{
+		return intValue;
+	}
+};
+
+
 
 bool ParseLine(const char *iter, Command *command);
 
 std::unordered_map<std::string, uint32_t> LoadTrapFile(const std::string &path);
 
-uint32_t EnvLookup(const std::string &);
-
+uint32_t VariableGet(const std::string &);
+void VariableSet(const std::string &name, uint32_t value);
 
 void Shell();
 void Help();